Briggs & Stratton Alternators & Charging Coils
Genuine Briggs & Stratton alternators and charging system components include stators, voltage regulators, rectifiers, and complete charging assemblies for lawn tractors and garden equipment. We hold charging system parts in stock and sell worldwide. Systems range from 3-amp unregulated DC to 16-amp regulated configurations including Dual Circuit, Tri-Circuit, and AC-only variants. Common failures include voltage regulators preventing battery charging, stator coil failures producing insufficient AC voltage, and damaged flywheel magnets reducing output. Proper system identification by wire colour ensures correct replacement parts. We stock Briggs & Stratton charging components globally for all alternator systems.
Available Briggs & Stratton Alternators & Charging Coils
Alternator
592830
Briggs & Stratton
£50.10
In Stock
Alternator
84012663
Briggs & Stratton
£54.75
In Stock
Alternator
597491
Briggs & Stratton
£43.35
In Stock
Alternator
691991
Briggs & Stratton
£66.40
In Stock
Alternator
84012662
Briggs & Stratton
£50.10
Available
Alternator Stator
84012661
Briggs & Stratton
£44.80
Available
Alternator
592831
Briggs & Stratton
£54.75
Available
Alternator
592828
Briggs & Stratton
£56.80
Available
Alternator
794103
Briggs & Stratton
£39.55
Available
Harness Alternator
691955
Briggs & Stratton
£49.50
Available
Alternator
695466
Briggs & Stratton
£63.75
Available
Ignition Switch
1686734SM
Briggs & Stratton
£25.30
In Stock
Frequently Asked Questions
How do I identify which alternator system my engine has?
Identify alternator type by stator wire colours—Dual Circuit uses red and black wires, Tri-Circuit has single wire with diodes, regulated systems use two black or two yellow wires connecting to voltage regulator. AC-only systems have white wire for lighting circuits. Flywheel magnet size determines output capacity—small magnets (22mm x 17mm) support 3-10 amp systems, large magnets (22mm x 23mm) provide 9-16 amp output. Check engine parts diagram using model-type-code numbers for exact system specification. Unregulated systems use single diode inline, regulated systems require separate voltage regulator/rectifier unit.
Why isn't my battery charging despite new voltage regulator?
Voltage regulators require minimum 5 volts battery voltage to activate charging circuit—deeply discharged batteries prevent regulator operation. Test stator AC output disconnected from regulator—10-amp systems should produce minimum 20 volts AC, 16-amp systems require 28-32 volts AC at full throttle (3600 RPM). Verify regulator ground connection quality through mounting bolts. Broken wires between stator and regulator prevent current flow. Red wire from regulator to battery must have continuous 12-volt supply through ignition switch when running. Failed stators show zero voltage or drastically reduced output on both leads.
What AC voltage should my stator produce?
Stator output varies by system type and must be tested at full engine speed (3600 RPM) with regulator disconnected. Dual Circuit systems produce 28-30 volts AC on lighting circuit, unregulated DC circuit uses diode for battery charging. Tri-Circuit stators generate 20-24 volts AC split between positive and negative diodes. Regulated 10-amp systems require minimum 20 volts AC whilst 16-amp systems need 28-32 volts AC between both black stator wires. Low AC voltage indicates weak flywheel magnets, damaged stator windings, or incorrect engine speed during testing.
Can I upgrade from Dual Circuit to regulated alternator?
Upgrading requires matching flywheel magnet size to desired output—small magnets limit systems to 10 amps maximum, large magnets support 16-amp regulated systems. Replace entire stator assembly and add voltage regulator/rectifier when converting from unregulated to regulated charging. Modify wiring harness removing old diodes from Dual Circuit and connecting stator leads to new regulator. Equipment electrical load determines minimum alternator amperage—electric PTO clutches require 9-16 amp systems, basic battery maintenance manages with 3-5 amps. Keyswitches may need replacement ensuring carburetor solenoid receives power during starting position.
Why does my charging system work intermittently?
Corroded connections between stator and voltage regulator create intermittent charging from poor electrical contact. Loose voltage regulator mounting allows ground connection to fail randomly. Flywheel magnets becoming loose or falling off eliminate magnetic field required for AC generation. Broken wires inside stator winding insulation cause intermittent opens during vibration. Safety switch wiring shorting to ground interrupts charging circuit. PTO clutch switches and seat safety switches sometimes interfere with charging system operation. Test each connection point individually isolating intermittent failures through repeated engine operation whilst monitoring battery voltage.